An extract on #speaker

Public speaker, one who gives a speech or lecture
Speaker (politics), the presiding officer in a legislative assembly
HMS Speaker (D90), a World War II Royal Navy aircraft carrier
Speaker, in linguistics, a grammatical person, first person as opposed to the addressee and bystanders
The Speaker, a BBC television series
The Speaker (periodical), a weekly review published in London from 1890 to 1907
Los Speakers (or "The Speakers"), a Colombian rock band from the 1960s
Tris Speaker, an American baseball player

The speaker's official role is to moderate debate, make rulings on procedure, announce the results of votes, and the like. The speaker decides who may speak and has the powers to discipline members who break the procedures of the chamber or house. The speaker often also represents the body in person, as the voice of the body in ceremonial and some other situations. The title was first recorded in 1377 to describe the role of Thomas de Hungerford in the Parliament of England.
By convention, speakers are normally addressed in Parliament as 'Mister Speaker', if a man, or 'Madam Speaker', if a woman. In other cultures other styles are used, mainly being equivalents of English "chairman" or "president". Many bodies also have a speaker pro tempore (or deputy speaker), designated to fill in when the speaker is not available.

The Speaker of the Australian House of Representatives is the presiding officer of the Australian House of Representatives, the lower house of the Parliament of Australia. The President of the Australian Senate is the presiding officer of the Australian Senate, the upper house of the Parliament of Australia.

Italian parliamentarism is centered on the Presidents of the two Houses, vested in defense of the members and of the assembly as a whole; so "the Speaker invites the representative of the Government not to deviate from the rules of parliamentary behavior". Now constitutional community highlights changes also in this role.

In Canada, the Speaker of the House of Commons is the individual elected to preside over the House of Commons, the elected lower house. The speaker is a Member of Parliament (MP) and is elected at the beginning of each new parliament by fellow MPs. The Speaker's role in presiding over Canada's House of Commons is similar to that of speakers elsewhere in other countries that use the Westminster system. The Speaker does not vote except in the case of a tie. By convention, if required to vote, the Speaker will vote in favour of continuing debate on a matter, but will not ultimately vote for a measure to be approved.
The Speaker of the Senate of Canada is the presiding officer of the Senate of Canada, the appointed upper house. The Speaker represents the Senate at official functions, rules on questions of parliamentary procedure and parliamentary privilege, and presides over debates and voting in the "Red Chamber". The Speaker of the Senate is appointed by the Governor General of Canada from amongst sitting senators upon the advice of the Prime Minister. The Speaker has a vote on all matters. In the event of a tie, the matter fails.
At the provincial level, the presiding officer of the provincial legidslatures is called the "Speaker" in all provinces except Quebec, where the term "President" is used. The presiding officer fulfills the same role as the Speaker of the House of Commons.